Federal Court judge Debbie Mortimer has dismissed a landmark case brought by former gambling addict Shonica Guy against Crown Melbourne and Aristocrat Technologies, finding that the design of their poker machines is not misleading or unconscionable.

Ms Guy alleged the Dolphin Treasure poker machines are misleading and deceptive, claiming they duped players about their chances of winning by giving the impression of an equal representation of symbols on the five electronic spinning reels.

However, Ms Mortimer ruled to a packed court of anti-poker machine advocates on Friday, that the ASX-listed companies were not in breach of consumer law and while she accepted the tragedy of gambling addiction on victims' lives, she found it was ultimately a matter for law-makers.

"It is no part of the court's task to characterise gambling as a desirable or undesirable activity, nor to engage with policy decisions made by the executive and legislative branches of government about whether those activities should be lawful, and if so, in what circumstances," the judge ruled.